M. rubra

M. rubra may refer to:
 * Marmosa rubra, the red mouse opossum, a South American marsupial species
 * Mesogona rubra, a moth species found in the Cascade Mountains north to Skamania County, Washington, United States
 * Microhyla rubra, a narrow-mouthed frog species found in India
 * Miomantis rubra, a praying mantis species
 * Morus rubra, the red mulberry, a plant species native to eastern North America
 * Mycteroperca rubra, the mottled grouper, a fish species
 * Myrica rubra, the yangmei or Chinese strawberry tree, a subtropical tree species
 * Myrmica rubra, the European fire ant or common red ant, an ant species found all over Europe